By: Rahul Kumar and D. I. Narkhede
Abstract
The requirement of retrofitting an old existing structure, rendered structurally unsafe (based on its structural health assessment) is observed to be a major challenge faced by engineers as it necessitates comprehensive and complicated repair procedures. It was further seen that during earthquake, the main reason for failure of any structure was the failure of its beam column joints, thereby making it essential to strengthen them specifically. Until recently, the two most common methods for strengthening defective RC beam-column joints were concrete jacketing and steel reinforcement. Geopolymer and Fiber reinforced polymers such as Carbon Fiber Reinforced Polymer (CFRP), Glass Fiber Reinforced Polymer (GFRP), and aramid FRP have recently emerged as new techniques for reinforcing the beam-column junction. In this study, using ANSYS Workbench 16, FEM analysis of T joints is carried out for comparative analysis of three retrofitting methods: Geo-polymer-based retrofitting, Conventional retrofitting, and retrofitting using GFRP. For this study, an existing G+3 RC building (1984 vintage) was chosen. In order to identify the critical joints of the building, its performance under static and seismic loading conditions was analyzed using STAAD.Pro and subsequently the retrofitting analysis of the critical joint was carried out by considering both the ends of column as hinged. Static load was applied at the free end of the cantilever beam to achieve results for key property attributes such as deformation, equivalent stress and equivalent strain. The paper elucidates the material properties, application methodologies, and interaction with RC structures that make these techniques viable for seismic retrofitting.
Keywords: Geo-polymer, GFRP, Retrofitting, Seismic resilience, ANSYS.
Citation:
Refrences:
1 B. O. Rageh, M. A. El-Mandouh, A. H. Elmasry, and M. M. Attia, “Flexural Behavior of RC Beams Strengthened with GFRP Laminate and Retrofitting with Novelty of Adhesive Material,” Buildings, vol. 12, no. 9, 2022, doi: 10.3390/buildings12091444.
2 Structural audit, Repair and rehabilitation of Building. Pavan Gund1, Prof. S. Nalawade2 1PG Student, Department of Civil Engineering, JSPM’S ICOER, Pune 412207, India. 2 Assistant Professor, Department of Civil Engineering, JSPM’S ICOER, Pune 412207, India.
3 D. A. Pohoryles, E. Commission, D. A. Bournas, and E. Commission, iRESIST + Innovative seismic and energy retrofitting of the existing building stock, no. June. 2021. doi: 10.2760/768985.
4 B. Kanagaraj, N. Anand, B. Praveen, S. Kandasami, E. Lubloy, and M. Z. Naser, “Physical characteristics and mechanical properties of a sustainable lightweight geopolymer based self-compacting concrete with expanded clay aggregates,” Dev. Built Environ., vol. 13, no. September 2022, p. 100115, 2023, doi: 10.1016/j.dibe.2022.100115.
5 D. A. Pohoryles, D. A. Bournas, F. Da Porto, A. Caprino, G. Santarsiero, and T. Triantafillou, “Integrated seismic and energy retrofitting of existing buildings: A state-of-the-art review,” J. Build. Eng., vol. 61, no. March, p. 105274, 2022, doi: 10.1016/j.jobe.2022.105274.
6 Cimellaro, G.P., Reinhorn A.M., Bruneau, M., ” Multidimensional Fragility of Structures: Formulation and Evaluation “, MCEER Technical Report (under review), 2005.
7 O. F. Otoom, W. Lokuge, W. Karunasena, A. C. Manalo, T. Ozbakkaloglu, and D. Thambiratnam, “Experimental and numerical evaluation of the compression behaviour of GFRP-wrapped infill materials,” Case Stud. Constr. Mater., vol. 15, no. August, p. e00654, 2021, doi: 10.1016/j.cscm.2021. e00654.
8 A. Raza, M. H. El Ouni, Q. uz Zaman Khan, and M. Berradia, “Structural assessment of eccentrically loaded GFRP reinforced circular concrete columns: Experiments and finite element analysis,” Compos. Struct., vol. 275, no. May, p. 114528, 2021, doi: 10.1016/j.compstruct.2021.114528.
9 “Comparative study of Conventional seismic retrofitting techniques”. Eleventh International Colloquium on Structural and Geotechnical Engineering. Medhat Kamal Abdullah.
10 A. Elbana and M. T. Junaid, “Determination of flexural capacity for GFRP-reinforced concrete beams retrofitted using external CFRP sheet,” Structures, vol. 27, no. July, pp. 1384–1395, 2020, doi: 10.1016/j.istruc.2020.07.003.
11 M. Wasim, T. D. Ngo, and D. Law, “A state-of-the-art review on the durability of geopolymer concrete for sustainable structures and infrastructure,” Constr. Build. Mater., vol. 291, p. 123381, 2021, doi: 10.1016/j.conbuildmat.2021.123381.
12 Study of various properties of geopolymer concrete – A review Subhankar Chowdhury, Subhashree Mohapatra, Ambar Gaur, Gaurav Dwivedi, Archana Soni (Energy Centre, Maulana Azad National Institute of Technology, Bhopal, India).
13 Dynamic analysis of laminated composite plates using a layer-wise mixed finite element model Y.M. Desai, G.S. Ramtekkar a, A.H. Shah b a Department of Civil Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India b Department of Civil Engineering.
